Sheet-packing



G. W. STEWART.

SHEET PACKING.

APPLICATION FILED SEPT. 30. 1919.

I ...QQ @l UNIT-ED s'rariazs Specification of Letters Patent.

PATENT' OFFICE.

Patented Mar. 1 1921.

Application filed September 30, 1919. Serial No. 327,362.

To aZZ whom t may concern:-

Be it known ,that I, GEORGE W. STEWART, residing at Weehawken, in the county of Hudson and State of New Jersey, have invented certain new and` useful Improvements in rSheet-Packing, of which the following is a specification.

his invention relates to sheet packing such as is commonly used f or the making of gaskets and the like. l

An object of the invention is to provide a sheet packing which is more substantial and durable in use than heretofore.

A more detailed object is to provide a packing consisting of a plurality of layers of different materials all compressed into sheet form and the whole being of such composition and consistency as to be capable of serving its intended purpose for greatly prolonged periods without likelihood of disintegration. I

Other objects and aims of the invention, more or less specific thanthose referred' to above, will be in part obvious rand in part pointed out in the course of the following description of the elements, combinations, arrangements of' parts and applications of principles, constituting the invention; and the scope of protection contemplated will be indicated in the appended claims.

In the accompanying drawings which are to be taken as a part of this specification, and in which I have shown merely a preferred form of embodiment of the invention t- Figure l` is a perspective view of a portion of sheet packing constructed in accordance p with this invention, certainJ of the layers of materials comprising the packing being shown spread apart for better disclosing the construction of the packing, and

Fig. 2 is an enlarged fragmentary sectional view through a portion of the packing shown in Fig. l.

Referring to the drawings for describing in detail the structure which is illustrated therein, the reference character L indicates one of the main layers of material employed.

Thereference character G indicates another similar layer 'and the reference character H indicates a layer of wire gauze or the' like which is placed between the layers L and G.

The layers L and G preferably consist of a composition of asbestos fiber and rubber properly compressed as is well known in connection with the manufacture of ordinary the opposite sides of the gauze H the fibrous y surfaces of the layers L and G are each coated with a layer, as 2, of cementitious material consisting preferably of a composi. tion of shellac and red lead. This coating is so applied that it adheres to and mixes with the protruding fibers forming the surfacesfof the layers L and G. In this way the coating is made to become substantially an integral portion of the layers L and G, separation being practically im ossible.

When the layers L and thus coated, are brought together under pressure against the opposite surfaces of the layer ofgauze H, the material form/ing the coatings is made to squeeze through the openings in the gauze and to adhere firmly the coating of one layer to the coating of the other layer. The pressure applied upon the outer Ysurface of the layers is preferably such as Vto cause lthe coatings to squeeze closely and firmly about all parts' of the gauze so that a good mechanical bond is effected.

If desiredv the gauze itself may be coated or painted over, as at 3, with the ycementitious material before it is placed between the layers L and G. In this way the cementitious material' of thecoatings 2 may be made to more easily and intimately tix themselves upon the gauze as well as upon each other. Y

If desired, also the outer surfaces of the main layers L and G may be coated over, as at 4, with a suitable waterproofing paint, or the like, such as shellac.

It has been notedy that gaskets formed from the usual compressed asbestos sheet packing are susceptible to early ldeteriorascribed, the composition of shellac and red lead so placed as to combine with the rub` ber and asbestos layers serves as a very ef- `fective moisture excluding agent, while atv the same-time not interfering with the desirable resiliency of the outermost lportions of the asbestos and rubber layers. The ex clusion of moisture from within the body of the packing will thus very materially delay the action of disintegrating forces and will enable a gasket, `formed of the packing, to maintain its original shane and effectiveness for long periods of time.

The Wire gauze is of equal importance in prolonging ,the life of the gasket since it will serve to hold the gasket against actual disintegration long after the process of dissolution and disintegration has begun.

In addition to its moisture excluding qualities the coatings 2 are equally .valuable in performing their ofiice of cementing together the main layers of rubber and asbestos upon the interposed gauze.

The Outer' coatings 4 of moisture proiofing material not only serve to increase the resistance of the packing to the effects of moisture but, especially when shellac is employed for these coatings, they also serve as a cement to cement the gaskets to the ma- -chine parts between which the gasket is placed in use, thus further delaying actual.

disintegration of the gasket.

'Thecoating 3, which is applied to the wire gauze prior to application of theI gauze between the layers of the packing, is particularly' advantageous since it effectively closes all of the interstices of the gauze and prevents likelihood ofthe formation of voids' or minute moisture carrying passages` along the wires of the gauze when the gauze has been placed betwen the layers. As many changes could be made in this construction without departing from the scope of the invention as defined in the foltogether and being of a moisture resisting character and coatings of cement material covering the outer surfaces of said layers for the purpose described.

2..A packing of the class described comprislng a pair of layers of resilient fibrous material each of said layers having a coating of moisture resisting cementitious material covering one of its surfaces, a layer ofiwire vgauze interposed between said first layers and said first layersbeing pressed against opposite sides of said `wire gauze so that said coatings engage together and here to each other and to said wire gauze.

3. A packing of the class described comprising a pair of layersof resilient fibrous material, each of said layers having a coating of moisture resisting cementitious material covering' one of its surfaces, a layer ofv wire gauze'interposed between said first layers, a coating of cementitious material covering the wires of said gauze, and said first layers being pressed against opposite sides of said wire gauze so that thev coatings of said first layers engage together and adhere to each other and to the coating of said wire gauze.

4. A packing of the class described comprising a pair of layers each consisting of a composition of asbestor fiber and rubber, each of said layers having a coating of moisture resisting cementitious material covering one of its surfaces consisting of a composition of red lead and shellac, a layer of wire gauze interposed between said first layers, and said first layers being pressed against opposite sides of said wire gauze so that said coatings engage together and adhere to each other and to said wire gauze.

5. A packing Vof theclass described comrisino a air of la ers each la er bein@r P e P e composed of a compressed composition of asbestos fiber and rubber, a layer of wire gauze interposed between said first layers, anda body of cementitious material also interposed between said first layers having saiid wire gauzev embedded therein holding all of said layers together. substantially throu hout their extent.

6. packing of the class described comprising a pair of layers of resilient fibrous material, moisture resisting material covering one surface of each of said layers, a layer of wire gauze interposed between said first layers, said first layers being positioned so that the surfaces of said moisture resisting material engage the vopposite sides of-said Wire gauze, and means holding all v of said layers `together throughout their extent.

In testimony whereof I affix my signature in the presence of two witnesses.-

GEORGE W. STEWART.

substantially Witnesses: 'L. GEssFonD HANDY,

S. J. AUMILLER. 

